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Abstract
Laser surface treatment (LST) results in significant improvement in fatigue crack growth resistance of an FeMnAl austenitic steel. The observed benificial effect is attributed to extensive crack closure as a result of compressive residual stresses originating from LST. The structure-sensitive nature of the crack growth operative in the base microstructure at low ΔK levels (up to ∼ 40 MPa m 1 2 with LST.
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